Dier will play Abel Luke, a lone wolf and old soul with a brooding intensity. There's something dangerous lurking inside him -- or he could be wounded and covering. His trust is hard won, but once you're in his inner circle, he'll never let you down.

Patterson will play the series regular role of Tess, Olivia's (Elizabeth Whitson) former best friend who is not involved with the curse. She'll appear in the subsequent Ravenswood episodes that follow the series' Halloween installments.

"As we dug deeper into the mythology of Ravenswood, we decided to re-conceive the character of Olivia. Merritt Patterson seemed to be the best choice for the direction the character is now headed," executive producers for Ravenswood said in a joint statement exclusive to THR.

Whitson [Patterson], meanwhile, will play Olivia, Abel's (Dier) twin sister and a former prom queen who has fallen from grace. She's learning who her real friends are after most everyone in her inner circle turns their backs on her. Recent events have left the once carefree and effortlessly happy Olivia questioning what's important.

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